Grinding wheel profile dressing device



Jan. 29, 1952 ENGELMANN 2,584,003

GRINDING WHEEL PROFILE DRESSING DEVICE Filed June 6, 1950 IN V EN TOR.

Patented Jan. 29, 1952 lorr es GRINDING WHEEL moms nasssnva,

' DEVICE NikolausEngelmann, Philadelphia, Pa. V Application June 6, 1950, Serial No. 166,422,

1 Claims. 1

Myinvention relates to new and useful improvements in grinding wheel profile dressing devices in which a lever, journalled for universal movements by a ball and socket joint adjacent the head end of said lever, the tail end of which operates over a form template, supports a dresser diamond or cutting element to the rear of but adjacent the location of the journal or pivot point which diamond is spaced in a predetermined ratio relative to the template holder and/or the working edge of said template and said journal. By mounting the template in either one of two slots, eleven and twelve inches, respectively, from the center of the pivot orjournal and ten inches from the center of the diamond cutter, a fiveto-one and a ten-to-one ratio of reduction will be accomplished. a

An object of my invention is to produce a simple and compact structure that will transfer a true outline from the template to the resulting profile of the grinding wheel.

Another object of the invention is to produce a structure of this kind having means to properly adjust the various elements prior to or at approximately the time of beginning the profile dressing operations on the grinding wheel.

Another object of this invention is to produce a structure capable of novel adjustments whereby small sharp corners and angles may be readily and easily formed in the profile during the dressing operations.

Another object of the present invention 'is to provide a diamond holder in the form of a crank for adjusting the diamond cutter to either side of the longitudinal center of the universally mo vable pivoted lever whereby further and extraordinary profile features may be dressed into the grinding wheel and the ratio of reduction between the template and diamond cutter can be changed.

Another object of the inventionis to provide means for temporarily holding the lever rigidly on the pivoting ball and socket joint to allow adjustment of the chisel pointed follower for the A still further object of the invention is to produce a plurality of arcuatef-slots in the rear part of the base to selectively hold a template in definite relationship to the pivpt point of the lever and the diamond cutter thereon.

With the above and other objects in view this invention consists of the detailsfof construction and combination of elements hereinafter set forth and then designated by the claims.

In. order that those skilled in the art to which this invention appertains may understand how to make and use the same I will describe its construction in detail, referring'by numerals to the accompanying drawing forming a part hereof, in which:

Fig. 1 is aside view of agrinQ- 'ns wheel profile dressing device constructed inaccordance with my invention and shown in relation to a grinding wheel being dressed, portions of the device being illustrated in section to depict some of the details of construction. H

Fig. 2 is a top plan view of the'device also with parts shown insection.

Fig. 3 is a front or head end as illustrated in Fig. l.

Fig. 4 is a section on the line 4-4 of Fig. 1.

Fig. 5 is a plan view of the sectional or twopiece dust guard.

In carrying out my invention'as herein embodied l0 represents a base frame'to be mounted on any suitable supporting surface ll adjacent a grinding wheel [2 which is to be dressed to any desirable formation on the periphery thereof.

The base frame includes a body l3, preferably having underneath hollowed out chambers for view of the device reducing the weight thereof, an upwardly projecting arm i l at the head end and an upwardly extending enlargement or tail fluke 15 at the rear end having a pair of spaced transversely extending arcuate slots 16 and ll in the upper portion thereof. Suitable set screws ii are associated with both slots, the same being threaded into the tail fluke from opposite faces, front and rear, so as to enter their respective adjacent slots and engage a thin template llselectively mounted in one of said slots. e

In a head arm I! is a stud or pivot 10 on which is swingingly mounted the ball structure 2| of a ball and socket joint. The ball structure 2| consists of a finger or pointer 22, a shank 23 extending in a straight line from the upper end of said finger and a ball 24 at the outer end of the shank.

A dressing lever 25 is of any desirable configuration but. preferably, is rectangular incross section and the tail end is tapered. In the head end of the lever is formed a longitudinal bore 26, the inner or bottom end of which is semi-spherical in shape, and a longitudinal slot 21, Fig. 1, is provided on the underneath side of the lever running from the terminal head end towards the tail end thereof and communicating with and substantially commensurate in length to said core.

A sliding block 28 is "mounted in the bore and has a semi-spherical surface opposed to the bottom wall of the bore 26 and forms with said bottom wall, a socket to receive the .ball 24 and thus provide a ball and socket joint for the mounting of the dressing lever. The block 28 is retained in engagement with the ball by a spring 29 having one end resting against the outer end of the block and the other end engaging a cap 30 screwed onto the head end of the dressing lever 25 to close the open end of the bore 26 and a part of the slot 2l.-v The tension of thespring cludes a companion rear plate having an aperture in one end to-register with the shank while the other end of said rear plate is plain and held. in place on; the under side of the dressing lever 25 by a clipsefi, Fig. 1, secured to said lever slightly towthe rear of the inner end of the slot'Zl. The apertured ends of the plates constituting the dust guard overlap so that solid portions of one plate closes the aperture of the other vplate beyondthe shank 23.

To temporarily fix the dressing lever 25 in a predetermined position a rod 3? is slidably mounted through holes in the cap and sliding block for projection into a hole in the ball 2-2, the latter hole-being in the longitudinal axis of the dressing lever when said a'xis'ishorizontal and parallel to the longer sides of the base frame iii. On the outer end-of the rod 3? is'a'stop 33 located outside of the captil and a second stop 39 also is mounted on the rod intermediate its ends and located on the inside of said cap. These steps coact with the cap to prevent detachment of the rod 37 fromlth e said cap butare spaced sufficiently to allow adequate movements for engaging said rod with and disengaging same from the ball.

In the body. of theidress'inglever 25 adjacent the ball and. socket joint are formed two vertical holes it and i! located in the longitudinal center of said lever and spaceda definite distance apart and from the balland socket joint relative to other elements of the apparatus. Set screws 42 and t3- are threadedintofthe dressing lever body from either-side thereof to project into the holes til, il, respectively, and hold "an tool. or tool holders in place therein. p p

The dressing lever '25 also has a pair of vertical holes til and'fi therein adjacent the tail end and these are also in the longitudinal center of the lever'and spaced. the same as the holes all and 4| so that the 'a'xe's'of'said holes M, 45 are directly aboveor in line with the arcuate slots left-i respectivelrset screws .48 and ii! are threaded into'ttheidressing .lever'from either-side will be of smaller 4 thereof to project into the respective holes 64, 45 and hold any rod-like article in place therein. A suitable knob i8 is mounted on the tail end of the dressing lever for conveniently manually operating said lever over the pattern edge of' the template. 7

A cutting tool 4%, usually provided with a diamond point to is selectively placed in either of the holes 49, ii and temporarily s cured by the proper set screws 32, E3 or said cutting tool may be inserted in a hole 51 in the outer end of the crank arm 52 and fastened by the set screw 53 :threaded into said crank arm so as to project into the holeEl and hold the cutting tool in place.

, The crank arm 52 is provided with a crank pin 55 which is inserted in either hole 49, 4| and fastened by a'screw d2, 43 after the crank arm has beenadjusted to a desired position.

A chisel pointed follower 55 is selectively mounted in one of the holes 44, 5 and temporarily securely held in place by one of the screws 36, ii after the desired or necessary longitudinal adjustment has been made.

The finger or pointer 22 is provided at its free end with a suitable formation 55%, such as an index mark, for cooperation with a set of indication marks ill on the front face of the head end of the body frame, said indication marks representing angular degrees at which the ball structure and dressing lever can be swung sidewise.

From the foregoing it will now be apparent that {have an exceedingl simple, coinpact, strong and elficient grinding wheel profile drcssing'device in which the dressing lfifviermay be universally swung on its ball and socket joint laterally or horizontally and perpendicularlyor vertically from its tail end whereby'the follower will travel over the edge formation of thet em plate to reproduce a desired contour on the circumferential surface of the grinding wheel by means of a cutting tool mounted on said dressing lever adjacent to the ball and socket jointbut between said joint and the location of the template. The cut formations on the grinding wheel dimensions than the template formations due tothe difference in movements of the tail end of the lever and that portion thereof in the region of the location of the cuttingtool. The ratio may be easily changed by placing the cutting tool in either of two tool receivingholes and locating the template in either of the two template receiving slots and positioning the follower for cooperation therewith. An additional adjustrhentcan be accomplished by using the tool holder and swinging it to one side or the other of the longitudinal axis of the lever, Fur-r ther, sharp angular and oddsurfaces'may be cut by swinging the ball structure oni'ts pivot which will move the dressing lever to one Sideof'the perpendicular, the angle being shown on the scale of indication marks. j

In actual practice, the apparatus 'ispositioned relative to a grindingwheel to be dressed and the rod 3? is projected into the hole in th'eball so that the dressing lever will be temporarily held in a straight line. The follower is then adjusted until its chisel end engages the upper edge formation. Thereafter the rod is withdrawn from the ball and the dressing lever is released for operation andby moving either the dressing device or grinding wheel towards one r n -w ee r i Of course I do not wishtg loe li nited the exact details of construction herein shown and described as these may be varied within the scope of the appended claims without departing from the spirit of my invention.

Having described my invention what 1 claim as new and useful is:

1. A grinding wheel profile dressing device comprising a frame having an upright arm at the head end and provided with means at the tail end to hold a template, a ball structure including a finger, a shank and a ball, means passing through the head arm and finger to swingingly adjustably mount the ball structure on the frame, a lever having a longitudinal bore in the head end and a slot on the underneath side of said lever and communicating with and of the same length as said bore, the bottom of said bore being semi-spherical to constitute a portion of a socket for the ball, a block slidably mounted in the bore and provided with a semi-spherical surface opposed to the bottom wall of said bore and forming therewith the complete socket to receive the ball with the shank in the slot, means to hold the block in the bore of the lever, said means including a cap detachably mounted on the head end of the lever and a spring in the bore engaging said cap and block said lever having two separate pairs of holes therethrough all in parallel relation to one another and in line with an axis through the ball and its shank and finger, one pair at the tail end of said lever and the other pair adjacent the ball and socket joint between it and the holes at the tail end, the holes of each pair being spaced and the same distances. a grinding wheel cutting means selectively mounted in either one of the pair of holes adjacent the ball and socket joint, and a follower having a chisel point selectively and adjustably mounted in either one of said other pair of holes.

2. The dressing device according to claim 1, in combination with a dust guard comprising two coacting plates having apertures to register with the shank of the ball structure and positioned in overlapping relation on the lever beneath the slot in the head of said lever, and means to hold the parts of the dust guard in place said means including a corrugated finger projecting from the outer end of one plate and projecting into the slot in the underneath side of the lever and entered into the cap, and a clip fastened to the underneath side of said lever to the rear of the slot and engaging the rear end of the other plate.

3. The dressing device according to claim 1 wherein the grinding wheel cutting means includes a crank shaped tool holder selectively mounted in either one of the pair of holes adjacent the ball and socket joint, and a cutting tool including a diamond removably mounted in the tool holder.

4. The dressing device according to claim 1, in

combination with a rod longitudinally slidably in the head of the lever and extending through the sliding block for projection into a hole in the ball when said lever is in a straight line relative to the frame.

5. The dressing device according to claim 1 wherein the terminal of the finger has a formation to function as a pointer, in combination with indication marks on the frame and with which the pointer formation cooperates to indicate the angular position of the ball and socket joint.

6. A grinding wheel profile dressing device comprising a base frame having an upright arm at the head end and an upwardly extending enlargement at the tail end, a ball of a ball and socket joint pivotally mounted on the upright arm, said enlargement having spaced curved slots in the upper portion thereof in arcs of radii whose axis is in the center of the ball, a template selectively mounted in either of said curved slots, in combination with a lever having a longitudinal bore in the head end thereof and provided with a slot on the underneath side of said lever and communicating with and of the same length as said bore, the bottom of said bore being semi-spherical to constitute a portion of a socket for a ball joint, a block slidably mounted in the bore and provided with a semi-spherical surface opposed to the bottom wall of said bore and forming therewith the complete ball socket in which the ball is mounted, a screw cap threaded on the head end of said lever, and. a spring in the lever bore between the screw cap and sliding block to urge the latter towards the ball.

7. The structure according to claim 6 wherein the pivoting means for the ball of the ball and socket joint includes a generally pendent shank projecting from the ball, a stud carried by the arm and extending from the forward face thereof and on which the shank is mounted for oscillation laterally of the base frame, and a finger extending in a straight line from said shank for cooperation with indicia on said forward face of said upright arm.

NIKOLAUS ENGELMAN N.

REFERENCES CITED The following references are'of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,686,802 Edgar Oct. 9, 1928 1,855,343 Edgar Apr. 26, 1932 2,308,317 Sneed Jan. 12, 1943 FOREIGN PATENTS Number Country Date 569,227 Great Britain May 14, 1945 

